electrical problem transmission flaring?

[MrIgor]

i have a 2003 h2. I bought it with the gears flaring (reving between shifts) No error codes. I replaced it with a rebuilt transmission, and same problem with flaring. I brought back the 2nd transmission they gave me another built transmission... installed it today and SAME PROBLEM! it revs between gears, (but shifts smoothly, after reving up 1000rpm obo).

I replaced the PCM, got it programmed at the dealer (all pins are perfect on the pcm)

What can cause this problem?

[PaHumBug]

I don't know but it sounds like it's not the tranny. I know you can adjust how soft and hard it will shift with a programmer, you could try that.

[jsbihn]

Ok,
So if I understand correctly, you are stating that the transmission worked or works fine except in between gears? That when you shift from say 1st to 2nd it will stay rev or stay in nuetral longer?

I assume that you installed the tranny and replaced all fluid that go with it?
This is a common problem if the fluid is too low.
Also did you check to see if the trans cooler is leaking?
And also did you check to make sure that it was pressurizing and such?
The trans might be good but if the fluid isnt getting there........

Also how long has it been since you have cleaned your TB and MAF?
This might be a solution.
I know it might sound stupid but alot of times the MAF doesnt get the right signal in between shifts and it over revs.

[MrIgor]

it revs between all gears feel like neutral longer. Otherwise it works perfect. New torque convert with tranny. New fluid. new larger cooler with new lines.

Cleaned the TB. Inspected MAF, looks clean. (installed new k&n intake, no change)


all 3 Transmissions had 0 codes. Transmissions are new inside, i saw both transmissions get built in front of me.


Questions: Aftermarket Programming can remove the rev flaring? (I have new PCM that was programmed at dealer)

[MrIgor]

If someone can start their hummer, and disconnect the negative cable from battery tell me if the gauges on dash, stereo work etc.. ( the truck will not shut off). Trying to test out my alternator.


Also If I disconnect my MAF I see no difference in idle or acceleration.

[jsbihn]

Ok, not sure why you are checking the ALT in regards to your transmission issue.... but then again who would think that a MAF would cause issues either....

With that said, if you unplug the MAF the ECU will get signals from temps, rpm, barometric pressure, and tps sensor readings to make a calculation of what amount of fuel should be injected. As long as the engine isnt all out modified and running iwith a new program, it shoud actually run pretty well without the MAF. Of course, if weather conditions, pressure, elevation, etc. change, the MAF will make the ECU adjust alot better then trying to caluclate which will make the engine run better.

Given, I am wondering if you drive the vehicle with the MAF unplugged do you still get the in between shift surges? I would think that if you didnt, it would be definitely the MAF and though it is cleaned could be signs it is bad.